Printing-press.



No. 703,438; Patented July I, I902.

R. MIEHLE.

PRINTING PRESS.

(Application filed-Aug. 12, 1901.)

2 Sheets-Sheet 1.

(No Model.)

WITNESSES INVENTOR. J m

A TTORNE VJ:

m: norms Pnzns co. PHOTD-LITHO., wuumorom n. s.

No. 703,438. Patented July 1, I902.

B. MIEHLE PRINTING PRESS.

(Application filed Aug. 12, 1901.)

(No Model.) 2 Sheets-Sheet 2.

WITNESSES: INVENTOR.

XM day/W UNITED STATES PATENT OFFICE.

ROBERT MIEHLE, OF CHICAGO, ILLINOIS.

PRINTING-PRESS.

SPECIFICATION formingpart of Letters Patent No. 703,438, dated Jul 1, 1902. Application filed August 12,- 1901. Serial No. 71,726. (No model.)

impression and is moved bodily toward and from the type-bed, so that the latter. may at times pass freely beneath it without contact.

The object of theinvention is to improve the mechanism by which the cylinder is thus moved bodily toward and from the type-bed;

and it consists in the matters hereinafter described, and particularly pointed out in the claims. 1

In the accompanying drawings, Figure 1 is a side elevationfpartly in section, of the parts of a printing-press embodying my invention; and Fig. 2 is a vertical cross-section.

As shown in said drawings, 3 3 represent parallel vertical upright portions of the machine-frame, between which are located the journal-boxes 1 4, supporting the journal 5 of the impression-chamber 6. Vertical rods 7 7 pass through and clamp the j ournal-boxes together and also extend downwardly to near the bottom of the frame, where they are inserted in guide-passages 8, formed in the frame. The 'boxes"are constantly urged upward by springs 9, each encircling oneof the rods and bearing against the lower box and supported on across-head 10. This crosshead is adj ustably supported from the main frame by screws 11 and is provided with openings forthe free passage of the rods 7. Near their lower ends therods pass through side recesses in a head 12, and-in proximity to said head they are threaded and provided with adj listing-nuts 13, which set under said head, and with lock-nuts 14 over said head. On the fiat upper surface of head 12 is a sliding block 15, recessed on top to fit the eccentric 16, carried by the rock-shaft 17 supported at its ends in the frame of the machine. The block slides on the head as compelled by the eccentric, and transmits to the head and through it to the rods a down thrust sufficient to move the impression-cylinder from its up per or non-actingposition,in which the springs 9 tend to keep'it to its lower or printing position. The eccentric-shaft is rocked by a cam-Wheel18,crank 19 on the shaft, and roller 20 traversing the groove of the wheel. A setscrew is customarily placed; under the journal-boxes to limit their down movement, and such a screw is shown at 21 in the cross or horizontal connection 22,uniting the uprights 3. The type-bed is shown at 23, the foot-lever of the tripping mechanism at 24, the feedtable at 25, the guide for the incoming paper at 26, the tumbler for positioning the cylinder-grippers at 27, and the stationary pin engaging the tumbler and reversingthe grip- 'pers at 28.

As thus far described, the mechanism for raising and lowering the cylinder is in use, and is essentially like that shown in my patents Nos. 550,992 and 611,923.

My present improvement consists in providing the journal-boxes with means other than the eccentric-shaft for positively stopping the upward movement of the cylinder. This may be done in various ways; but the construction I prefer is that illustrated. Bridging the space between the uprights 3 3 and over the journal-boxes is a bar 29, preferably hinged at 30 to a stationary part of the press and made fastto both said uprights by bolts 31 31. Between this bar and theuppersurface of the journal-box I insert a'blockor plate 32 of metal andrsecure it to the box, preferablyby screws 33." When the boxes areallowedto risebythe eccentricshaft, the springs 9 forcethem upward until the block 32 contacts with the bar 29. The bar is thus made to serve as a positive limit to the throw of the springs, and consequently "it is not necessary to 'devolvethat function entirely on the eccentric-shaft.

By the use of this improvement I find that the action of the press is muchbenefited. It was previously necessary to relieve temporarily the shaft from the tension of the springs in order to get the lubricant properly distributed to all parts of the eccentrics and the bearings of the eccentric-shaft; but since the adoption of the'improvem'en't this has been unnecessary. The registration is also improved, as the invention prevents any overthrow by the springs and insures the lifting TOO of the cylinder to the same height at each operation, so that the grippers always act uniformly and take hold of the sheets at the same distance from the edge, and the feedtable is always at the same distance from the cylinder when the sheets are fed, and therefore occasions no variation in the action of the grippers.

It will be understood that the stop devices described are employed at both ends of the cylinder, as well as the cylinder lifting and depressing devices. The block 32 is simply a flat piece of metal, and can of course be very readily changed or reduced in thickness, or filling material can be inserted between it and the upper journal-box.

I claim 1. The combination with a two-revolution impression-cylinder, its lifting-springs and depressing-eccentrics, of positive stop devices other than the eccentrics limiting the upward throw of the springs and relieving the spring tension, substantially as specified.

2. The combination with a two-revolution impression-cylinder and its lifting-springs and depressing-eccentrics, of rigid cross-bars attached to the frame of the machine above the cylinder-bearings and acting to limit the upward movements of the cylinder received from the springs, substantially as specified.

3. The combination with a vertically-moving impression-cylinder receiving its upward movements from springs and its downward movement from eccentrics, of stationary stop devices coming in contact with the cylinderbearings and limiting the action of the spring and relieving the eccentrics, substantially as specified.

ROBERT MIEHLE.

Witnesses:

H. M. MUNDAY, EDW. S. EVARTS. 

